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Effect of superplasticizers on hydration and setting behaviour of cements

Nicolas Robeyst UGent and Nele De Belie UGent (2009) ACI SYMPOSIUM PUBLICATION. SP 262. p.61-73
abstract
Cement-superplasticizer compatibility has become a major area of interest due to the increasing use of high performance and self-compacting concrete mixtures. The interaction between superplasticizer and cement can cause significant retardation effects on the hydration and setting properties of cement. However, not much data have been published to quantify this. In this study, mortar mixtures with three cement types and two different superplasticizers were tested by calorimetric and ultrasonic measurements to investigate the effects on both hydration and setting. Also the strength of the mortar samples was tested. The types of superplasticizers used, were polycondensates of naphtalene sulphonate (PNS) and polycarboxylic ethers (PCE). Based on the ultrasonic measurements, the addition of PCE and PNS caused an initial setting retardation of approximately 1.2 and 3.4 h on the portland cement, 1.9 and 4.8 h on the portland-fly ash cement and 0.5 and 1.6 h on the blast-furnace cement mixtures. This difference decreased after 16 to 20 h when the stiffness development of the samples with PNS or PCE approached the mixtures without superplasticizers. Similar to the setting, the release of the heat of hydration was more postponed by the addition of PNS than by PCE. Contrary to PNS, PCE benefited the strength of the mortar mixtures. Generally, the effect of the superplasticizers clearly differed according to the cement type in the mixture.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
Superplasticizer, Hydration, Blast-furnace cement, Portland-fly ash cement, Setting, Portland cement
in
ACI SYMPOSIUM PUBLICATION
ACI Symp. Publ.
editor
P Gupta, TC Holland and VM Malhotra
volume
SP 262
issue title
Ninth ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
pages
61 - 73
publisher
American Concrete Institute (ACI)
conference name
9th ACI international conference on Superplasticizers and other chemical admixtures in Concrete
conference location
Sevilla, Spain
conference start
2009-10-12
conference end
2009-10-16
ISBN
9780973150780
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1000744
handle
http://hdl.handle.net/1854/LU-1000744
date created
2010-07-02 08:25:49
date last changed
2016-12-19 15:35:34
@inproceedings{1000744,
  abstract     = {Cement-superplasticizer compatibility has become a major area of interest due to the increasing use of high performance and self-compacting concrete mixtures. The interaction between superplasticizer and cement can cause significant retardation effects on the hydration and setting properties of cement. However, not much data have been published to quantify this. In this study, mortar mixtures with three cement types and two different superplasticizers were tested by calorimetric and ultrasonic measurements to investigate the effects on both hydration and setting. Also the strength of the mortar samples was tested. The types of superplasticizers used, were polycondensates of naphtalene sulphonate (PNS) and polycarboxylic ethers (PCE).
Based on the ultrasonic measurements, the addition of PCE and PNS caused an initial setting retardation of approximately 1.2 and 3.4 h on the portland cement, 1.9 and 4.8 h on the portland-fly ash cement and 0.5 and 1.6 h on the blast-furnace cement mixtures. This difference decreased after 16 to 20 h when the stiffness development  of the samples with PNS or PCE approached the mixtures without superplasticizers. Similar to the setting, the release of the heat of hydration was more postponed by the addition of PNS than by PCE. Contrary to PNS, PCE benefited the strength of the mortar mixtures. Generally, the effect of the superplasticizers clearly differed according to the cement type in the mixture.},
  author       = {Robeyst, Nicolas and De Belie, Nele},
  booktitle    = {ACI SYMPOSIUM PUBLICATION},
  editor       = {Gupta, P and Holland, TC and Malhotra, VM},
  isbn         = {9780973150780},
  keyword      = {Superplasticizer,Hydration,Blast-furnace cement,Portland-fly ash cement,Setting,Portland cement},
  language     = {eng},
  location     = {Sevilla, Spain},
  pages        = {61--73},
  publisher    = {American Concrete Institute (ACI)},
  title        = {Effect of superplasticizers on hydration and setting behaviour of cements},
  volume       = {SP 262},
  year         = {2009},
}

Chicago
Robeyst, Nicolas, and Nele De Belie. 2009. “Effect of Superplasticizers on Hydration and Setting Behaviour of Cements.” In Aci Symposium Publication, ed. P Gupta, TC Holland, and VM Malhotra, SP 262:61–73. American Concrete Institute (ACI).
APA
Robeyst, N., & De Belie, N. (2009). Effect of superplasticizers on hydration and setting behaviour of cements. In P. Gupta, T. Holland, & V. Malhotra (Eds.), ACI SYMPOSIUM PUBLICATION (Vol. SP 262, pp. 61–73). Presented at the 9th ACI international conference on Superplasticizers and other chemical admixtures in Concrete, American Concrete Institute (ACI).
Vancouver
1.
Robeyst N, De Belie N. Effect of superplasticizers on hydration and setting behaviour of cements. In: Gupta P, Holland T, Malhotra V, editors. ACI SYMPOSIUM PUBLICATION. American Concrete Institute (ACI); 2009. p. 61–73.
MLA
Robeyst, Nicolas, and Nele De Belie. “Effect of Superplasticizers on Hydration and Setting Behaviour of Cements.” Aci Symposium Publication. Ed. P Gupta, TC Holland, & VM Malhotra. SP 262. American Concrete Institute (ACI), 2009. 61–73. Print.